Author(s)

F. Addeo, B. Allotta, M. Malvezzi, L. Pugi, A. Tarasconi & M. Violani

Abstract

Automatic Train Protection (ATP) systems ensure that trains comply with speed restrictions and prevents them passing red signals. They are designed in order to automatically act to slow or stop the train where trains exceed speed limits or pass signals at danger. Their safety and reliability is then crucial for the safety and efficiency of the whole railway system. A correct estimation of distance to target and actual velocity is fundamental to evaluate residual braking resources, in terms of available deceleration, in order to reach the targets at the required speeds. The so-called odometry algorithm is the ATP subsystem devoted to train speed and travelled distance evaluation: it is composed by a series of sensors and a software procedure that ac

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